6399794511 has 24 divisors (see below), whose sum is σ = 10188504144. Its totient is φ = 3838671360.

The previous prime is 6399794477. The next prime is 6399794519. The reversal of 6399794511 is 1154979936.

6399794511 is a `hidden beast` number, since 6 + 39 + 9 + 7 + 94 + 511 = 666.

It is not a de Polignac number, because 6399794511 - 2⁷ = 6399794383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399794519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323616 + ... + 342821.

It is an arithmetic number, because the mean of its divisors is an integer number (424521006).

Almost surely, 2^6399794511 is an apocalyptic number.

6399794511 is a deficient number, since it is larger than the sum of its proper divisors (3788709633).

6399794511 is a wasteful number, since it uses less digits than its factorization.

6399794511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666551 (or 666548 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 6399794511 is about 79998.7156834408. The cubic root of 6399794511 is about 1856.6156624939.

The spelling of 6399794511 in words is "six billion, three hundred ninety-nine million, seven hundred ninety-four thousand, five hundred eleven".